Articles tagged with Expanding Universe
Researchers studied dark matter's potential additional attractive force and found it suppresses structure growth, contrary to expectations. The extra clustering effect is counterbalanced by a decrease in dark matter particles' mass over time, reducing the overall impact on cosmic microwave background observations.
Gravastars may form when a star collapses under its own mass, triggering the creation of a mini universe with dark energy. This equilibrium stabilizes the object, preventing it from becoming a black hole.
New study by University of Southampton confirms the universe's expansion is still accelerating as previously found, debunking 2025 claims that the cosmos was slowing. The team re-evaluated data using Type Ia supernovae to calculate vast cosmic distances and found no error in their methods.
An international team of astrophysicists has confirmed the universe's expansion is accelerating, contradicting a recent claim that it was slowing down. The researchers used Type Ia supernovae to determine the acceleration of the cosmos, with no flaw in the widely-accepted theory of dark energy.
Researchers tracked galaxy clusters to test gravity's strength, finding it weakens with distance as predicted by Newton and Einstein. The study confirms the existence of invisible dark matter, closing the door on alternative theories like Modified Newtonian Dynamics.
A Simon Fraser University researcher believes his team's new research may bring them closer to cracking the Hubble tension, a decades-old question about the universe's expansion rate. The theory centers on primordial magnetic fields, which could have accelerated recombination and affected the value of the Hubble constant.
A new study published in Monthly Notices of the Royal Astronomical Society suggests that the universe's expansion may have started to slow rather than accelerate at an ever-increasing rate. The findings cast doubt on the long-standing theory of dark energy, which is believed to be driving distant galaxies away increasingly faster.
A recent study used Japan's Fugaku supercomputer to simulate the effects of time-varying dark energy on cosmic evolution. The results show that a higher matter density creates stronger gravitational forces, leading to earlier and more efficient formation of massive galaxy clusters.
The Nancy Grace Roman Space Telescope will feature a 'sunblock' shield made of lightweight yet stiff panels designed to limit heat transfer. The observatory's instruments will benefit from this design, which can detect faint signals from space.
Researchers from Penn University propose a five-member particle package, known as the 5-plet, that string theory cannot accommodate. This particle family is absent in any known string-based calculation, raising concerns about the framework's validity.
Roman's surveys will investigate dark energy and dark matter governing cosmic evolution, and study the demographics of worlds beyond our solar system. The missions include High-Latitude Wide-Area Survey, High-Latitude Time-Domain Survey, and Galactic Bulge Time-Domain Survey.
Researchers propose universe may rotate with one rotation every 500 billion years, resolving Hubble tension paradox and explaining discrepancies in astronomical measurements. The theory is compatible with current models and doesn't break any known laws of physics.
UTA's expansion of its undergraduate research program has enabled students to present their work at major symposiums, including the American Institute of Aeronautics and Astronautics conference. The program has strengthened students' commitment to pursuing graduate studies in various fields.
A new dataset of nearly 4,000 nearby supernovae has revealed a surprising diversity in the explosive transients of white dwarf stars, with multiple exotic ways they can blow up. These discoveries have implications for measuring distances in the Universe and understanding dark energy.
The release of a unique Type Ia Supernovae dataset has significant implications for cosmologists measuring the universe's expansion history. The dataset, comprising 3628 supernovae, provides unprecedented precision and accuracy in exploring the properties of these events.
A new optical technology developed at UC Riverside enables gravitational-wave detectors to reach extreme laser powers, overcoming limitations that hinder the detection of cosmic phenomena. This breakthrough is expected to significantly expand our view of the universe, particularly in the earliest stages of its history.
NASA has successfully integrated its deployable aperture cover sunshade with the outer barrel assembly of the Roman Observatory, enhancing the telescope's ability to detect faint light from across the universe. The integration marks a significant milestone in the mission's assembly and testing phase.
New measurements of the Hubble constant support a faster-than-expected Universe expansion rate, challenging current understanding of physics. A precise distance measurement to the Coma Cluster provides the foundation for this new result.
A team of physicists and astronomers found that the Universe is expanding in a more varied way than previously thought, making dark energy unnecessary. The new evidence supports the timescape model of cosmic expansion, which attributes differences in stretching light to calibration issues rather than dark energy.
The new Webb Space Telescope study confirms Hubble's expansion rate measurements, offering a crucial cross-check to address the mismatch in measurements. The discrepancy remains unexplained even by the best cosmology models, suggesting that our understanding of the universe may be incomplete.
The VST-SMASH survey captures new images of five galaxies showcasing their unique structures and assembly histories. The Italian National Institute for Astrophysics (INAF) at ESO Paranal observatory used the VST telescope to produce these glorious galaxy portraits.
The telescope will focus cosmic light and send it to Roman's instruments, revealing billions of objects in space. The assembly underwent rigorous tests simulating launch conditions, temperature control, and gas handling.
A French-Swiss team has discovered a slight discrepancy between Einstein's predictions and measurements of gravitational lensing from the Dark Energy Survey. The study found that the depth of gravitational wells varied with cosmic history, challenging the validity of Einstein's theories for explaining phenomena beyond our solar system.
Researchers investigate universe expansion, Big Bang, black holes, and dark energy using a time-reversal model. They propose an explanation for the Big Bang and explore interior structure of black holes.
A new study proposes that early dark energy could explain the formation of numerous bright galaxies in the early universe, resolving the 'Hubble tension' puzzle. The team modeled galaxy formation with a brief appearance of early dark energy, finding it fits observations and solves both puzzles.
A new study published in Physical Review Letters suggests that nanohertz gravitational waves may not originate from supercool first-order phase transitions. Researchers found that such transitions would struggle to complete, shifting the frequency of the waves away from nanohertz frequencies.
Researchers propose that simple forms of ultra-light scalar field matter could generate detectable gravitational wave backgrounds soon after the Big Bang. This discovery could shed light on dark matter and its role in the universe's mass, offering a new avenue for fundamental physics research.
Astronomers have discovered an enormous circular radio feature around a galaxy, dubbed the Cloverleaf, which was created by clashing groups of galaxies. The XMM-Newton satellite has detected X-ray emission associated with this structure for the first time, revealing clues about its formation and the merger process.
A new study has sorted through models attempting to solve the cosmological tension, a discrepancy between two ways of calculating the universe's expansion. Three models that were previously viable solutions were excluded by the new data, while others reduced the tension but not solved it.
Researchers have discovered a star orbiting a massive black hole 33 times heavier than the sun's mass, located 1500 light-years away from Earth. The binary system Gaia BH3 contains an ordinary star that seems to have formed over ten billion years ago.
Researchers used thermodynamics to describe the expansion of the Universe, finding that adiabatic and anisotropic effects are accompanied by cooling due to the barocaloric effect. The study proposes a novel way to investigate anisotropic effects associated with the expansion of the Universe.
Researchers from the DESI collaboration have created a largest 3D map of cosmos ever constructed, measuring expansion history with precision better than 1%. The analysis confirms basics of Lambda-CDM model but hints at possible evolution of dark energy over time.
The expansion rate of the universe is faster than predicted, according to NASA's Webb and Hubble telescopes. By combining data from both telescopes, scientists have ruled out measurement errors as the cause, suggesting that new physics may be at play.
The commercial space sector has seen significant growth, with over 2,660 satellites launched into orbit in recent years. International collaborations are also expanding, enabling diverse perspectives and new ideas to emerge in science and space exploration.
Researchers from Universities of Bonn and St. Andrews propose an alternative theory of gravity as the cause of the discrepancy in measured values of the Hubble-Lemaitre constant. This 'modified Newtonian dynamics' (MOND) theory predicts the existence of regions with lower matter density, which would explain the observed deviations.
Astronomers combined the Webb and Hubble telescopes to capture a detailed portrait of the cosmos, revealing a galaxy cluster about 4.3 billion light-years from Earth. The image showcases magnified supernovae and individual stars, providing insights into the universe's first stars and the forces driving its expansion.
Researchers have carried out the largest ever computer simulations to investigate the Universe's evolution, taking into account ordinary matter and dark energy. The FLAMINGO simulations provide a detailed picture of virtual galaxies and galaxy clusters, allowing for comparisons with observations from new high-powered telescopes.
Researchers propose that black holes can exist in equilibrium as 'perfect pairs' within an ever-expanding Universe. This concept challenges traditional understanding of black hole behavior and interactions.
A new method using colliding neutron stars may help resolve the discrepancy in measuring the universe's expansion rate. By analyzing the symmetry of kilonovae, astronomers can calculate distances to galaxies more accurately than current methods.
The James Webb Space Telescope has refined measurements of the Hubble constant using Cepheid variables. The observations provide new insights into the universe's expansion rate and its implications for the cosmos.
A team of researchers from the University of Tokyo has measured dark matter halo masses around ancient quasars, finding a consistent mass of about 10 trillion times the mass of our sun. This discovery suggests a characteristic DMH mass that activates quasars regardless of time period.
A WVU astronomer is searching the Milky Way for debris left behind by supernovas, with $331,170 in NSF funding. He hopes to discover new supernova remnants using radio wavelength data from telescopes and machine-learning software.
Researchers have found that studying the mass and movement of the Andromeda galaxy and the Milky Way could help place an upper limit on the value of dark energy. The technique may provide valuable insights into the mysterious force, but it is not yet a direct detection.
A team of researchers has proposed a new method to measure the cosmic expansion by studying gravitational waves. The method involves counting repeat black hole mergers and analyzing the delay between them, allowing for accurate measurement of the universe's expansion rate.
Researchers used quasar data to analyze time dilation in the early universe, confirming that it was running at five times slower. By observing nearly 200 quasars, scientists were able to standardize their 'ticking' and chart the expansion of space.
Researchers propose using lensed gravitational waves from binary black holes to measure cosmic expansion. The method uses the delays between repeat appearances of these signals to encode the universe's expansion rate. This approach does not rely on knowing the exact locations or distances of binary black holes, making it a promising to...
Researchers from UNIGE have developed a new method to test the validity of Einstein and Euler's theories on the accelerating Universe expansion and dark matter. The study uses time distortion as a never-before-used measure, allowing for differentiation between the two equations.
Researchers discovered a gravitationally lensed supernova named SN Zwicky, which was magnified nearly 25 times by a foreground galaxy. This discovery presents an opportunity to study the inner cores of galaxies, dark matter, and the mechanics behind universe expansion.
A team of researchers from the University of Minnesota has successfully measured the expansion rate of the Universe using data from a magnified supernova. Their findings provide new insight into the problem and bring scientists closer to obtaining the most accurate measurement of the Universe's age.
Researchers from the Atacama Cosmology Telescope collaboration have created a groundbreaking new image that reveals the most detailed map of dark matter distributed across a quarter of the entire sky. The study confirms Einstein's theory of how massive structures grow and bend light, supporting the standard model of cosmology.
A new study by EPFL researchers has calibrated the best cosmic yardsticks to unprecedented accuracy, further amplifying the Hubble tension. The Hubble constant is measured in kilometers per second per megaparsec and has puzzled astrophysicists and cosmologists worldwide.
A team of researchers has discovered evidence of 'cosmological coupling' between black holes and the universe's expanding energy. By studying supermassive black holes in ancient galaxies, they found that these black holes gain mass over billions of years, matching predictions for black holes that cosmologically couple with vacuum energy.
Astronomers have cataloged over 51,863 Lyman-alpha-emitting galaxies, 123,891 star-forming galaxies, and 4,976 active galactic nuclei using HETDEX's spectroscopic data. The survey is a non-targeted, moon-sized survey that collects spectra from 35,000 fiber optic cables, providing a unique dataset for future galaxy mapping.
Researchers Martin S. Sloth and Florian Niedermann introduce New Early Dark Energy (NEDE) as a solution to the Hubble tension problem, suggesting a phase transition in dark energy that explains different measurement results for the universe's expansion rate.
A team of astronomers discovered 87 galaxies that could be the earliest known galaxies in the universe using data from NASA's James Webb Space Telescope. This finding suggests a revision to our understanding of galaxy formation, indicating that more galaxies may have formed earlier than previously thought.
Researchers found that neurons in the hippocampus represent space in a nonlinear hyperbolic geometry that grows outward exponentially with time spent exploring an environment. This discovery provides valuable methods for analyzing data on neurocognitive disorders involving learning and memory.
A new study by University at Buffalo physicists Will Kinney and Nina Stein reveals that the latest cyclic model introduces a new problem: the universe must have a beginning. This finding contradicts previous theories, which aimed to address entropy concerns by proposing endless cycles of expansion and contraction.
Scientists at Kyoto University propose a novel approach using holograms to approximate the universe's expansion in de Sitter space. The model uses conformal field theory and a positive integer for the cosmological constant, enabling the identification of the first example of two-dimensional CFT.
A 1931 paper by Albert Einstein featuring a dynamic model of the universe has been re-examined, highlighting numerical errors and questionable calculations. The model, which includes a contraction phase, contrasts with the widely known expanding Einstein-de Sitter model.
In 1917 Einstein applied general relativity to a static universe, introducing the cosmological constant to address gravitational collapse. He resisted expanding universe views despite contemporary suggestions from astrophysicists Alexander Friedman and Georges Lemaître.